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    <title>Document</title>
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<script>
        // 编写函数has(arr , 60) 判断数组中是否存在60这个元素，返回布尔类型

        function has(arr, d){
        for(var i=0;i<arr.length;i++){
            if(arr[i] === d){
                return true;
            }
        }
        return false;
    }

    var arr2 = [10,20,30,40,50,60];
    var res = has(arr2, 60);
    console.log(res);
    console.log(arr2);
</script>
</html>